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Approximate controllability of semilinear deterministic and stochastic evolution equations in abstract spaces. (English) Zbl 1084.93006
In the paper semilinear, infinite-dimensional, continuous-time control systems are considered. Fundamental definitions concerning approximate and stochastic controllability in infinite-dimensional control systems are recalled and discussed. Using methods and theorems taken directly from functional analysis, sufficient conditions for approximate controllability are formulated and proved. These conditions require verification of approximate controllability of associated linear control system. Moreover, two illustrative examples are also included. Similar problems have been considered in [{\it J. Klamka}, Control Cybern. 29, No. 1, 153--165 (2000; Zbl 1011.93001)].

93C25Control systems in abstract spaces
93C10Nonlinear control systems
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